Improvement



C. E. DULIN.

Pipe -ouplings- Patented Dec. 29,1874.

mvENTORl 600%@ WITNESSES ATTO R N EY S,

THE GRAPHIC CU. PHOT0'UTH.39 F41 PARK PLACEJ-Y.

'UNITED IMPROVEMENT EN PIPEnCOUPLINGS.

Specification forming part of Letters Patent No. Iiii, dated December 29, 1874; appllication Filed I November 28, 1874.

To atl whom it may concern:

Be it known that I, CHARLES E. DULrN, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have in vented a new and valuable Improvement in Pipe-Couplings; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specitication, and to the letters and tigures ot' reference marked thereon.

Figure 1 of the drawing is a representation of a side view of my pipe-coupling. Fig. 2 is a longitudinal central sectional view ot' the same; and Fig. 3 is a transverse sectional view.

This invention has relation to couplings for lead and other soft-metal pipes.

The Object of, the invention is to produce a means whereby the ends ot' the pipes to be coupled will be screw-threaded in the act ot' being inserted into the ends ot' the coupling, thus rigidly connecting them together, and at the saine time forming airtight joints.

To this end the nature ofthe invention consists in a notch cut longitudinally in the edges ot' a tubular coupling having right and let't screw-threaded ends, whereby the inner edges of the said thread are inwardly burred u p, attordin g cutting-edges, whereby the ends ot' the said pipes are provided with corresponding male threads when they are inserted into the said coupling, the cuttings tlzereby made escaping through the notch, as will be hereinafter more fully explained.

In the annexed drawings, A designates my improved coupling, consisting ot' two female screw-threaded sleeves, B B, connected by a prismatic portion, C, the said thread being in one cut to the right, and in the other to the left. e designates a notch cut longitudinally in the edge otl the sleeves B B, either by tiling or by bringing the said edge in contact with a suitable saw. By this means the interior of the notch is slightly burred up inwardly, affording a cutting-edge, c, i'or a purpose hereinafter explained.

After the sleeves B B are provided with their right and left screw-threads, their front inner surfaces are turned o by a suitable tool, forming a smooth annular space, c', oi' greater diameter than the rest of the interior of the sleeves, which serves as a guide, whereby the pipe :may be accurately directed in the same plane with the longitudinal axis of the sleeve, inward within reach ot' the screw-threads.

The two pipes having been inserted into the sleeves of the coupling, I secure them thereto by turning one -to the right and the other to the left, when they will be immedi-V ately seized by their screw-threads and drawn inward toward each other. During their inward progress, the burr c, formed when the notches a were cut, will automatically cut the male thread upon the said pipes, which, becoming engaged with the female threads in the rear of the said cuttingedge, will, if the pipes be still turned, tin-ally bring the ends of the pipes I) in rigid contact, as shown in Fig. 2, the said cutting-edge forming the male threads during the whole time of the inward progress of the pipes, so that they may now be taken ont by unserewing, and reapplied when necessary.

By means of the notches a, not only is a cutting-edge, c, formed, but a means is at`- forded whereby the cuttings may escape from the sleeves, as shown in Fig. 3, thereby greatly adding to the facility with which the threads are made, and also et't'ectually preventing clogging.

In practice l propose to make the female threads ot' the sleeves l5 B slightly tapering', but do not propose to confine lnyselt' to that construction.

It will be seen from the above description that the male thread on the ends ot the pipes to be coupled are accurately cut thereon by the ci'ltting-edge c dnrin g the in ward progress ofthe said pipes; also, that the cuttings, bein allowed to escape through the notches e, will not clog and render the act ot' inserting the pipes unduly laborious.

It will also be seen that my improved coup 2 News@ ling, being also a thread-cutter, may be used B', thereby forming a cutting-edge, c, sub.- in the shop to form the said threads on the stantially as speeitied.

pipes, which may then be uneoupled, eonven- In testimony that I claim the above I have iently carried to any desired locality, and hereunto subscribed my name in the presence there expeditiously and readily set up. of two Witnesses.

What I claim as new, and desire to secure l CHAS. E. DULIN. by Letters Patent, is- Witnesses:

In a coupling for soft metal pipes, the H. DIENELT,

notches a, out into the edges of the sleeves B GEORGE F. EISENHARDT. 

